I use the water management kit( 5991-0029EN) and the tune ran to completion for years. In the last 2 months I have only gotten it to complete once! That was after a source cleaning ( tune failed after the cleaning) the following day I vented and sonicated the lenses in MeOH.

The tune process starts with an autotune, could my issue be due to a corrupt autotune?

I am using an old 5973 running E.02.02, and purging the BFB (25 ml). Yesterday I vented and sonicated the lens in water, meoh, acetone, and hexane. I installed a new repeller and 2 filaments.I had cleaned the source in early Aug, so that's why just a rinse. No joy with the BFB_tune. I got a herb-tune that seems to be working. Some compound peaks in my 0.5 standard are splitting.

I wonder if I "over clean" my VOC source. I give all the lenses and body a scrubbing with the alumina powder at least every 6 months. Is this really necessary? Some folks claim to only sonicate parts in methanol.